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Anybody have this error with Creo 4? And if yes how you manage it, I don't want to start with an older version of my model.
I think I found what is make Creo Simulate Save Error!
If you use "Save a copy" of an assembly for a Creo Simulate, the newly created copy will not be able to be saved after modifications.
The best way is to do a backup of the current version and rename it after that.